In this paper the heat transfer characteristics of a two-phase closed thermosyphon over a wide range of heat transfer rates, system pressure, aspect ratios and filling ratios were studied. The experiments focused on the boiling and condensation heat transfer characteristics of a thermosyphon with a copper tube having 25 and 32 mm inside and outside diameters. Distilled water was used as the wor...

An experimental investigation of the performance of thermosyphons charged with water as well as the dielectric heat transfer liquids FC-84, FC-77 and FC-3283 has been carried out. The copper thermosyphon was 200 mm long with an inner diameter of 6 mm, which can be considered quite small compared with the vast majority of thermosyphons reported in the open literature. The evaporator length was 4...

This computational study investigates the nonlinear dynamics of unstable convection in a 2D thermal convection loop (i.e., thermosyphon) with heat flux boundary conditions. The lower half of the thermosyphon is subjected to a positive heat flux into the system while the upper half is cooled by an equal-butopposite heat flux out of the system. Water is employed as the working fluid with fully te...

This article reports a recent study on the application of a two-phase closed thermosyphon (TPCT) in a thermosyphon for economizer (TPEC). The TPEC had three sections of equal size; the evaporator, the adiabatic section, and the condenser, of 250 mm × 250 mm × 250 mm (W × L × H). The TPCT was a steel tube of 12.7-mm ID. The filling ratios chosen to study were 30, 50, and 80% with respect to the ...

Two-phase thermosyphon loops (TPTLs) are widely used in air-conditioning field for heat recovery and free cooling utilization in recent years. The height difference between the condenser and the evaporator is always considered as the driven force of thermosyphon. However, experiments show the cooling capacity of the TPTLs is not linearly improved with the increase of the height difference. So, ...

In this paper, flow characteristics of a two-phase loop thermosyphon under vertical reciprocating vibration are visually investigated with N-pentane as the working fluid. The tests performed for heating power range 20 W to 40 W, filling ratio 30 % 70%, and m?s-2, 35 Hz vibration. effect on is by comparing obtained results those acquired in static, thereby providing basis explaining heat transfe...

This study explores the effects of pipe wall properties (thermal conductivity k and thickness tw) on heat transfer performance a rectangular thermosyphon with phase change material (PCM) suspension geometric configuration (aspect ratio = 1; dimensionless heating section length 0.8; relative elevation between cooling sections 2) that ensures optimum efficiency in section. The following parameter...

A water-based functionalized nanofluid was made by surface functionalizing the ordinary silica nanoparticles. The functionalized nanofluid can keep long-term stability. and no sedimentation was observed. The functionalized nanofluid as the working fluid is applied in a thermosyphon to understand the effect of this special nanofluid on the thermal performance of the thermosyphon. The experiment ...

This paper reports a study on the effect of the heat flux, cooling water flow rate, fill ratio and extra volume on the overall performance of a partially vacuumed <span style="font-size: 10pt; color: #...

In order to research the special embankment (thermosyphon embankment) damages and distribution of permafrost under Qinghai–Tibet Highway (QTH) embankment. The section K2952–K2953, which is a typical representative QTH, was chosen for detection in determine sources damages. this study, performance characteristics embankment, active layer, table found ground-penetrating radar (GPR) images were re...